MPI_TAG_UB is not a constant, it is a predefined attribute. As such it should be accessed using the attribute accessors (MPI_COMM_GET_ATTR page 229 in the MPI 2.2 standard).


On Mar 13, 2012, at 13:51 , Timothy Stitt wrote:

Hi Jeff,

I went through the procedure of compiling and running, then copied the procedure verbatim from the command line (see below). 

[tstitt@memtfe] /pscratch/tstitt > more mpitag.f90
program mpitag

  use mpi

  implicit none

  integer :: err

  call MPI_INIT(err)
  print *,MPI_TAG_UB

  call MPI_FINALIZE(err)

end program mpitag
[tstitt@memtfe] /pscratch/tstitt > mpif90 --version
ifort (IFORT) 12.0.2 20110112
Copyright (C) 1985-2011 Intel Corporation.  All rights reserved.

[tstitt@memtfe] /pscratch/tstitt > mpiexec --version
mpiexec (OpenRTE) 1.4.3

[tstitt@memtfe] /pscratch/tstitt > mpif90 -o mpitag mpitag.f90 
[tstitt@memtfe] /pscratch/tstitt > mpiexec -n 2 ./mpitag 

Let me know if you need any further information.



On Mar 13, 2012, at 1:39 PM, Jeffrey Squyres wrote:

Tim --

I am unable to replicate this problem with a 1.4 build with icc.

Can you share your test code?

On Mar 10, 2012, at 7:30 PM, Timothy Stitt wrote:

Hi all,

I was experimenting with MPI_TAG_UB in my code recently and found that its value is set to 0 in my v1.4.3 and v1.4.5 builds (these are the only builds I have available to test).

Oddly it only happens with my builds compiled with the Intel compiler. The PGI builds do produce a non-zero value. Has anyone else experienced this?


users mailing list

Jeff Squyres
For corporate legal information go to:

users mailing list

Tim Stitt PhD (User Support Manager).
Center for Research Computing | University of Notre Dame |
P.O. Box 539, Notre Dame, IN 46556 | Phone:  574-631-5287 | Email: 

users mailing list